Anacardiaceae
Sumac Family
2 genera
4 species
1 subspecies and varieties
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Rhus glabrasmooth sumac
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Mexico, east to the Atlantic Coast.
Habitat: Dry hillsides and draws, low to moderate elevations.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
Rhus typhinastaghorn sumac
Distribution: Occurring in scattered locations in Washington; occurring scattered states in western North America; native from central U.S. east to the Atlantic Coast.
Habitat: Disturbed areas; escaping from cultivation.
Origin: Introduced from eastern North America
Flowers: May-July
Growth Duration: Perennial
Toxicodendron diversilobumPacific poison-oak
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Nevada.
Habitat: Open woods at low elevations.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
Toxicodendron radicanswestern poison ivy
Distribution: Occurring east of the Cascades crest in Washington; occurring throughout much of North America, except Alaska, California, southeastern U.S. and northeastern Canada.
Habitat: Generally in the lowlands and foothills and into the lower mountains in open areas or forest edges.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
var. rydbergii – poison-ivy, western poison-ivy